From owner-freebsd-amd64@FreeBSD.ORG Mon Sep 27 15:45:41 2004 Return-Path: Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3E2A616A4CE for ; Mon, 27 Sep 2004 15:45:41 +0000 (GMT) Received: from rwcrmhc11.comcast.net (rwcrmhc11.comcast.net [204.127.198.35]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0A81E43D2D for ; Mon, 27 Sep 2004 15:45:41 +0000 (GMT) (envelope-from rob2@pythonemproject.com) Received: from [192.168.1.102] (c-67-169-203-186.client.comcast.net[67.169.203.186]) by comcast.net (rwcrmhc11) with ESMTP id <2004092715454001300lqlkne> (Authid: europax); Mon, 27 Sep 2004 15:45:40 +0000 Message-ID: <415835EB.9060600@pythonemproject.com> Date: Mon, 27 Sep 2004 08:46:51 -0700 From: Rob User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.2) Gecko/20040816 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Joseph Fenton References: <20040924210947.GC6597@iib.unsam.edu.ar> <20040926024730.GA2530@dragon.nuxi.com> <415753BD.2040107@pythonemproject.com> <4157637F.9090009@error404.nls.net> <41577570.6020000@npgcable.com> In-Reply-To: <41577570.6020000@npgcable.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: freebsd-amd64@freebsd.org Subject: Re: freebsd i386 on amd64 hardware? X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 27 Sep 2004 15:45:41 -0000 Joseph Fenton wrote: > Ketrien I. Saihr-Kesenchedra wrote: > >> >> Bearing in mind that I don't work for AMD, my understanding is that >> AMD has always planned on three sockets for the Athlon64 - 754 (single >> channel), originally because it can be put on a 5-layer PCB. Socket >> 940 for Opterons for dual channel, but requiring a 6-layer PCB. And >> Socket 939 because that one less pin allows for 5-layer PCBs and dual >> channel. > > > The 754 socket (one HT port and single-channel mem) was destined for > laptops. The 940 (three HT ports and dual-channel mem) needs the extra > layers for proper operation. The 939 keeps the dual-channel, but replaces > two of the HT ports with extra power and ground pins. All the extra power > and ground pins means less current surge and therefore needs fewer layers. > Making it one pin less keeps you from accidentally sticking it in the wrong > socket. > > _______________________________________________ > freebsd-amd64@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-amd64 > To unsubscribe, send any mail to "freebsd-amd64-unsubscribe@freebsd.org" > Thanks guys for the clarification. Rob.